✨ Update README for 2024 challenges and add solution details

Author: marcode24

README.md

@@ -1,7 +1,7 @@
 <div align="center">
   <img
-    alt="adventjs-2023"
-    src="https://res.cloudinary.com/dfeujtobk/image/upload/v1701756989/Challenges/u0qn1htendtskutrml9j.png"
+    alt="adventjs-2024"
+    src="https://res.cloudinary.com/dfeujtobk/image/upload/v1733035253/advent-js/Apex_1733035172447_syuzaa.png"
     width="1200"
     style="border-radius: 1rem" />
   <br />
@@ -44,17 +44,33 @@ npm run test:2021
 npm run test:2022
 # or
 npm run test:2023
+# or
+npm run test:2024
 
 # Run specific test
 npm run test 'year'/'challenge'/index.test.js
 
 ```
 
-## 🎯 2023 Challenges
+## 🎯 2024 Challenges
 
 <details open>
 <summary>Show / Hide</summary>
 
+|  #  | Challenge                                                                                   | Difficulty |                                           My Solution                                                           |   My Score    |
+| :-: | ------------------------------------------------------------------------------------------- | :--------: | :------------------------------------------------------------------------------------------------------------:  | :-----------: |
+| 01  | [🎁 ¡Primer regalo repetido!](https://adventjs.dev/es/challenges/2024/1)                       |     🟢     |                        [here](./2024/01-primer-regalo-repetido/index.js)                                        |  ⭐⭐⭐⭐⭐  |
+
+Difficulties legend:
+🟢 Easy 🟡 Medium 🔴 Hard
+
+</details>
+
+## 🎯 2023 Challenges
+
+<details hide>
+<summary>Show / Hide</summary>
+
 |  #  | Challenge                                                                                   | Difficulty |                                           My Solution                                                           |
 | :-: | ------------------------------------------------------------------------------------------- | :--------: | :------------------------------------------------------------------------------------------------------------:  |
 | 01  | [¡Primer regalo repetido!](https://adventjs.dev/es/challenges/2023/1)                       |     🟢     |        [here](https://github.com/marcode24/adventjs-solutions/tree/main/2023/01-primer-regalo-repetido)         |